src/mesa/main/state.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file state.c
  28  * State management.
  29  *
  30  * This file manages recalculation of derived values in struct gl_context.
  31  */
  32
  33
  34 #include "glheader.h"
  35 #include "mtypes.h"
  36 #include "arrayobj.h"
  37 #include "context.h"
  38 #include "debug.h"
  39 #include "macros.h"
  40 #include "ffvertex_prog.h"
  41 #include "framebuffer.h"
  42 #include "light.h"
  43 #include "matrix.h"
  44 #include "pixel.h"
  45 #include "program/program.h"
  46 #include "program/prog_parameter.h"
  47 #include "shaderobj.h"
  48 #include "state.h"
  49 #include "stencil.h"
  50 #include "texenvprogram.h"
  51 #include "texobj.h"
  52 #include "texstate.h"
  53 #include "varray.h"
  54
  55
  56 static void
  57 update_separate_specular(struct gl_context *ctx)
  58 {
  59    if (_mesa_need_secondary_color(ctx))
  60       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  61    else
  62       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  63 }
  64
  65
  66 /**
  67  * Update the following fields:
  68  *   ctx->VertexProgram._Enabled
  69  *   ctx->FragmentProgram._Enabled
  70  *   ctx->ATIFragmentShader._Enabled
  71  * This needs to be done before texture state validation.
  72  */
  73 static void
  74 update_program_enables(struct gl_context *ctx)
  75 {
  76    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
  77     * program is enabled AND valid.  Similarly for ATI fragment shaders.
  78     * GLSL shaders not relevant here.
  79     */
  80    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
  81       && ctx->VertexProgram.Current->Base.Instructions;
  82    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
  83       && ctx->FragmentProgram.Current->Base.Instructions;
  84    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
  85       && ctx->ATIFragmentShader.Current->Instructions[0];
  86 }
  87
  88
  89 /**
  90  * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point
  91  * to the current/active programs.  Then call ctx->Driver.BindProgram() to
  92  * tell the driver which programs to use.
  93  *
  94  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
  95  * programs or programs derived from fixed-function state.
  96  *
  97  * This function needs to be called after texture state validation in case
  98  * we're generating a fragment program from fixed-function texture state.
  99  *
 100  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 101  * or fragment program is being used.
 102  */
 103 static GLbitfield
 104 update_program(struct gl_context *ctx)
 105 {
 106    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 107    const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;
 108    struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 109    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 110    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 111    const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;
 112    GLbitfield new_state = 0x0;
 113
 114    /*
 115     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 116     * pointers to the programs that should be used for rendering.  If either
 117     * is NULL, use fixed-function code paths.
 118     *
 119     * These programs may come from several sources.  The priority is as
 120     * follows:
 121     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 122     *   2. ARB/NV vertex/fragment programs
 123     *   3. Programs derived from fixed-function state.
 124     *
 125     * Note: it's possible for a vertex shader to get used with a fragment
 126     * program (and vice versa) here, but in practice that shouldn't ever
 127     * come up, or matter.
 128     */
 129
 130    if (fsProg && fsProg->LinkStatus
 131        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 132       /* Use GLSL fragment shader */
 133       _mesa_reference_shader_program(ctx,
 134                                      &ctx->Shader._CurrentFragmentProgram,
 135                                      fsProg);
 136       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 137                                (struct gl_fragment_program *)
 138                                fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 139       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 140                                NULL);
 141    }
 142    else if (ctx->FragmentProgram._Enabled) {
 143       /* Use user-defined fragment program */
 144       _mesa_reference_shader_program(ctx,
 145                                      &ctx->Shader._CurrentFragmentProgram,
 146                                      NULL);
 147       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 148                                ctx->FragmentProgram.Current);
 149       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 150                                NULL);
 151    }
 152    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 153       /* Use fragment program generated from fixed-function state */
 154       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 155
 156       _mesa_reference_shader_program(ctx,
 157                                      &ctx->Shader._CurrentFragmentProgram,
 158                                      f);
 159       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 160                                (struct gl_fragment_program *)
 161                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 162       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 163                                (struct gl_fragment_program *)
 164                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 165    }
 166    else {
 167       /* No fragment program */
 168       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 169       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 170                                NULL);
 171    }
 172
 173    if (gsProg && gsProg->LinkStatus
 174        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 175       /* Use GLSL geometry shader */
 176       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 177                                (struct gl_geometry_program *)
 178                                gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program);
 179    } else {
 180       /* No geometry program */
 181       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 182    }
 183
 184    /* Examine vertex program after fragment program as
 185     * _mesa_get_fixed_func_vertex_program() needs to know active
 186     * fragprog inputs.
 187     */
 188    if (vsProg && vsProg->LinkStatus
 189        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 190       /* Use GLSL vertex shader */
 191       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 192                                (struct gl_vertex_program *)
 193                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 194    }
 195    else if (ctx->VertexProgram._Enabled) {
 196       /* Use user-defined vertex program */
 197       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 198                                ctx->VertexProgram.Current);
 199    }
 200    else if (ctx->VertexProgram._MaintainTnlProgram) {
 201       /* Use vertex program generated from fixed-function state */
 202       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 203                                _mesa_get_fixed_func_vertex_program(ctx));
 204       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 205                                ctx->VertexProgram._Current);
 206    }
 207    else {
 208       /* no vertex program */
 209       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 210    }
 211
 212    /* Let the driver know what's happening:
 213     */
 214    if (ctx->FragmentProgram._Current != prevFP) {
 215       new_state |= _NEW_PROGRAM;
 216       if (ctx->Driver.BindProgram) {
 217          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 218                           (struct gl_program *) ctx->FragmentProgram._Current);
 219       }
 220    }
 221
 222    if (ctx->GeometryProgram._Current != prevGP) {
 223       new_state |= _NEW_PROGRAM;
 224       if (ctx->Driver.BindProgram) {
 225          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 226                             (struct gl_program *) ctx->GeometryProgram._Current);
 227       }
 228    }
 229
 230    if (ctx->VertexProgram._Current != prevVP) {
 231       new_state |= _NEW_PROGRAM;
 232       if (ctx->Driver.BindProgram) {
 233          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 234                             (struct gl_program *) ctx->VertexProgram._Current);
 235       }
 236    }
 237
 238    return new_state;
 239 }
 240
 241
 242 /**
 243  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 244  */
 245 static GLbitfield
 246 update_program_constants(struct gl_context *ctx)
 247 {
 248    GLbitfield new_state = 0x0;
 249
 250    if (ctx->FragmentProgram._Current) {
 251       const struct gl_program_parameter_list *params =
 252          ctx->FragmentProgram._Current->Base.Parameters;
 253       if (params && params->StateFlags & ctx->NewState) {
 254          new_state |= _NEW_PROGRAM_CONSTANTS;
 255       }
 256    }
 257
 258    if (ctx->GeometryProgram._Current) {
 259       const struct gl_program_parameter_list *params =
 260          ctx->GeometryProgram._Current->Base.Parameters;
 261       /*FIXME: StateFlags is always 0 because we have unnamed constant
 262        *       not state changes */
 263       if (params /*&& params->StateFlags & ctx->NewState*/) {
 264          new_state |= _NEW_PROGRAM_CONSTANTS;
 265       }
 266    }
 267
 268    if (ctx->VertexProgram._Current) {
 269       const struct gl_program_parameter_list *params =
 270          ctx->VertexProgram._Current->Base.Parameters;
 271       if (params && params->StateFlags & ctx->NewState) {
 272          new_state |= _NEW_PROGRAM_CONSTANTS;
 273       }
 274    }
 275
 276    return new_state;
 277 }
 278
 279
 280
 281
 282 static void
 283 update_viewport_matrix(struct gl_context *ctx)
 284 {
 285    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 286
 287    ASSERT(depthMax > 0);
 288
 289    /* Compute scale and bias values. This is really driver-specific
 290     * and should be maintained elsewhere if at all.
 291     * NOTE: RasterPos uses this.
 292     */
 293    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 294                          ctx->Viewport.X, ctx->Viewport.Y,
 295                          ctx->Viewport.Width, ctx->Viewport.Height,
 296                          ctx->Viewport.Near, ctx->Viewport.Far,
 297                          depthMax);
 298 }
 299
 300
 301 /**
 302  * Update derived multisample state.
 303  */
 304 static void
 305 update_multisample(struct gl_context *ctx)
 306 {
 307    ctx->Multisample._Enabled = GL_FALSE;
 308    if (ctx->Multisample.Enabled &&
 309        ctx->DrawBuffer &&
 310        ctx->DrawBuffer->Visual.sampleBuffers)
 311       ctx->Multisample._Enabled = GL_TRUE;
 312 }
 313
 314
 315 /**
 316  * Update the ctx->Color._ClampFragmentColor field
 317  */
 318 static void
 319 update_clamp_fragment_color(struct gl_context *ctx)
 320 {
 321    if (ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
 322       ctx->Color._ClampFragmentColor =
 323          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 324    else
 325       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 326 }
 327
 328
 329 /**
 330  * Update the ctx->Color._ClampVertexColor field
 331  */
 332 static void
 333 update_clamp_vertex_color(struct gl_context *ctx)
 334 {
 335    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 336       ctx->Light._ClampVertexColor =
 337          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 338    else
 339       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 340 }
 341
 342
 343 /**
 344  * Update the ctx->Color._ClampReadColor field
 345  */
 346 static void
 347 update_clamp_read_color(struct gl_context *ctx)
 348 {
 349    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 350       ctx->Color._ClampReadColor =
 351          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 352    else
 353       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 354 }
 355
 356 /**
 357  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 358  */
 359 static void
 360 update_twoside(struct gl_context *ctx)
 361 {
 362    if (ctx->Shader.CurrentVertexProgram ||
 363        ctx->VertexProgram._Enabled) {
 364       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 365    } else {
 366       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 367                                             ctx->Light.Model.TwoSide);
 368    }
 369 }
 370
 371
 372 /*
 373  * Check polygon state and set DD_TRI_OFFSET
 374  * in ctx->_TriangleCaps if needed.
 375  */
 376 static void
 377 update_polygon(struct gl_context *ctx)
 378 {
 379    ctx->_TriangleCaps &= ~DD_TRI_OFFSET;
 380
 381    if (   ctx->Polygon.OffsetPoint
 382        || ctx->Polygon.OffsetLine
 383        || ctx->Polygon.OffsetFill)
 384       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 385 }
 386
 387
 388 /**
 389  * Update the ctx->_TriangleCaps bitfield.
 390  * XXX that bitfield should really go away someday!
 391  * This function must be called after other update_*() functions since
 392  * there are dependencies on some other derived values.
 393  */
 394 #if 0
 395 static void
 396 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 397 {
 398    ctx->_TriangleCaps = 0;
 399
 400    /*
 401     * Points
 402     */
 403    if (1/*new_state & _NEW_POINT*/) {
 404       if (ctx->Point.SmoothFlag)
 405          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 406       if (ctx->Point._Attenuated)
 407          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 408    }
 409
 410    /*
 411     * Lines
 412     */
 413    if (1/*new_state & _NEW_LINE*/) {
 414       if (ctx->Line.SmoothFlag)
 415          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 416       if (ctx->Line.StippleFlag)
 417          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 418    }
 419
 420    /*
 421     * Polygons
 422     */
 423    if (1/*new_state & _NEW_POLYGON*/) {
 424       if (ctx->Polygon.SmoothFlag)
 425          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 426       if (ctx->Polygon.StippleFlag)
 427          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 428       if (ctx->Polygon.FrontMode != GL_FILL
 429           || ctx->Polygon.BackMode != GL_FILL)
 430          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 431       if (ctx->Polygon.OffsetPoint ||
 432           ctx->Polygon.OffsetLine ||
 433           ctx->Polygon.OffsetFill)
 434          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 435    }
 436
 437    /*
 438     * Lighting and shading
 439     */
 440    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 441       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 442    if (_mesa_need_secondary_color(ctx))
 443       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 444 }
 445 #endif
 446
 447
 448 /**
 449  * Compute derived GL state.
 450  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 451  * be called before rendering anything.
 452  *
 453  * Calls dd_function_table::UpdateState to perform any internal state
 454  * management necessary.
 455  *
 456  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 457  * _mesa_update_buffer_bounds(),
 458  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 459  */
 460 void
 461 _mesa_update_state_locked( struct gl_context *ctx )
 462 {
 463    GLbitfield new_state = ctx->NewState;
 464    GLbitfield prog_flags = _NEW_PROGRAM;
 465    GLbitfield new_prog_state = 0x0;
 466
 467    if (new_state == _NEW_CURRENT_ATTRIB)
 468       goto out;
 469
 470    if (MESA_VERBOSE & VERBOSE_STATE)
 471       _mesa_print_state("_mesa_update_state", new_state);
 472
 473    /* Determine which state flags effect vertex/fragment program state */
 474    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 475       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 476                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 477                      _NEW_PROGRAM | _NEW_FRAG_CLAMP | _NEW_COLOR);
 478    }
 479    if (ctx->VertexProgram._MaintainTnlProgram) {
 480       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 481                      _NEW_TRANSFORM | _NEW_POINT |
 482                      _NEW_FOG | _NEW_LIGHT |
 483                      _MESA_NEW_NEED_EYE_COORDS);
 484    }
 485
 486    /*
 487     * Now update derived state info
 488     */
 489
 490    if (new_state & prog_flags)
 491       update_program_enables( ctx );
 492
 493    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 494       _mesa_update_modelview_project( ctx, new_state );
 495
 496    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 497       _mesa_update_texture( ctx, new_state );
 498
 499    if (new_state & _NEW_BUFFERS)
 500       _mesa_update_framebuffer(ctx);
 501
 502    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 503       _mesa_update_draw_buffer_bounds( ctx );
 504
 505    if (new_state & _NEW_POLYGON)
 506       update_polygon( ctx );
 507
 508    if (new_state & _NEW_LIGHT)
 509       _mesa_update_lighting( ctx );
 510
 511    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 512       update_twoside( ctx );
 513
 514    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 515       update_clamp_vertex_color(ctx);
 516
 517    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 518       _mesa_update_stencil( ctx );
 519
 520    if (new_state & _NEW_PIXEL)
 521       _mesa_update_pixel( ctx, new_state );
 522
 523    if (new_state & _MESA_NEW_SEPARATE_SPECULAR)
 524       update_separate_specular( ctx );
 525
 526    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 527       update_viewport_matrix(ctx);
 528
 529    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 530       update_multisample( ctx );
 531
 532    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 533       update_clamp_read_color(ctx);
 534
 535    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 536       update_clamp_fragment_color(ctx);
 537
 538 #if 0
 539    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 540                     | _NEW_STENCIL | _MESA_NEW_SEPARATE_SPECULAR))
 541       update_tricaps( ctx, new_state );
 542 #endif
 543
 544    /* ctx->_NeedEyeCoords is now up to date.
 545     *
 546     * If the truth value of this variable has changed, update for the
 547     * new lighting space and recompute the positions of lights and the
 548     * normal transform.
 549     *
 550     * If the lighting space hasn't changed, may still need to recompute
 551     * light positions & normal transforms for other reasons.
 552     */
 553    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 554       _mesa_update_tnl_spaces( ctx, new_state );
 555
 556    if (new_state & prog_flags) {
 557       /* When we generate programs from fixed-function vertex/fragment state
 558        * this call may generate/bind a new program.  If so, we need to
 559        * propogate the _NEW_PROGRAM flag to the driver.
 560        */
 561       new_prog_state |= update_program( ctx );
 562    }
 563
 564    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 565       _mesa_update_array_object_max_element(ctx, ctx->Array.ArrayObj);
 566
 567  out:
 568    new_prog_state |= update_program_constants(ctx);
 569
 570    /*
 571     * Give the driver a chance to act upon the new_state flags.
 572     * The driver might plug in different span functions, for example.
 573     * Also, this is where the driver can invalidate the state of any
 574     * active modules (such as swrast_setup, swrast, tnl, etc).
 575     *
 576     * Set ctx->NewState to zero to avoid recursion if
 577     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 578     */
 579    new_state = ctx->NewState | new_prog_state;
 580    ctx->NewState = 0;
 581    ctx->Driver.UpdateState(ctx, new_state);
 582    ctx->Array.NewState = 0;
 583    if (!ctx->Array.RebindArrays)
 584       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 585 }
 586
 587
 588 /* This is the usual entrypoint for state updates:
 589  */
 590 void
 591 _mesa_update_state( struct gl_context *ctx )
 592 {
 593    _mesa_lock_context_textures(ctx);
 594    _mesa_update_state_locked(ctx);
 595    _mesa_unlock_context_textures(ctx);
 596 }
 597
 598
 599
 600
 601 /**
 602  * Want to figure out which fragment program inputs are actually
 603  * constant/current values from ctx->Current.  These should be
 604  * referenced as a tracked state variable rather than a fragment
 605  * program input, to save the overhead of putting a constant value in
 606  * every submitted vertex, transferring it to hardware, interpolating
 607  * it across the triangle, etc...
 608  *
 609  * When there is a VP bound, just use vp->outputs.  But when we're
 610  * generating vp from fixed function state, basically want to
 611  * calculate:
 612  *
 613  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 614  *                 potential_vp_outputs )
 615  *
 616  * Where potential_vp_outputs is calculated by looking at enabled
 617  * texgen, etc.
 618  *
 619  * The generated fragment program should then only declare inputs that
 620  * may vary or otherwise differ from the ctx->Current values.
 621  * Otherwise, the fp should track them as state values instead.
 622  */
 623 void
 624 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 625                              GLbitfield64 varying_inputs )
 626 {
 627    if (ctx->varying_vp_inputs != varying_inputs) {
 628       ctx->varying_vp_inputs = varying_inputs;
 629       ctx->NewState |= _NEW_ARRAY;
 630       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 631    }
 632 }
 633
 634
 635 /**
 636  * Used by drivers to tell core Mesa that the driver is going to
 637  * install/ use its own vertex program.  In particular, this will
 638  * prevent generated fragment programs from using state vars instead
 639  * of ordinary varyings/inputs.
 640  */
 641 void
 642 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 643 {
 644    if (ctx->VertexProgram._Overriden != flag) {
 645       ctx->VertexProgram._Overriden = flag;
 646
 647       /* Set one of the bits which will trigger fragment program
 648        * regeneration:
 649        */
 650       ctx->NewState |= _NEW_PROGRAM;
 651    }
 652 }